Finding the Fourth Proportional to 150,123.96, 207,080.82 and 99,137.16

Step by Step Solution

1. Step 1: Write the proportion equation
   150,123.96 : 207,080.82 = 99,137.16 : x
2. Step 2: Convert to fraction form
   150,123.96/207,080.82 = 99,137.16/x
3. Step 3: Cross multiply
   150,123.96x = 207,080.82 × 99,137.16
4. Step 4: Simplify right side
   150,123.96x = 20,529,404,385.27
5. Step 5: Solve for x
   x = 20,529,404,385.27/150,123.96
6. Step 6: Final answer
   x = 136,749.69